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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989495f07844152931146c683b4c993552fc1a19a6ae3b48c0ae4771a2a746aa' 
  AND token = 'uVCMSI4g3GivwqIo4IDCqF6IMgNgk2oUCQlws5pJZTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}